package com.lcx.demo.nioday01;

import org.junit.Test;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

public class TestBlockingNIO1 {
    //客户端
    @Test
    public void client() throws IOException {
        SocketChannel sChannel = SocketChannel.open(new InetSocketAddress("127.0.0.10",9876));

        FileChannel inChannel = FileChannel.open(Paths.get("./src/1.jpg"), StandardOpenOption.READ);

        ByteBuffer byteBuffer = ByteBuffer.allocate(1024);

        while(inChannel.read(byteBuffer)!=-1){
            byteBuffer.flip();
            sChannel.write(byteBuffer);
            byteBuffer.clear();
        }

        sChannel.shutdownOutput();

        //接受服务端的反馈
        int len = 0;
        while((len=sChannel.read(byteBuffer))!= -1){
            byteBuffer.flip();
            System.out.println(new String(byteBuffer.array(),0,len));
            byteBuffer.clear();
        }

        inChannel.close();
        sChannel.close();

    }

    //服务端
    @Test
    public void server() throws IOException {
        //获取通道
        ServerSocketChannel ssChannel = ServerSocketChannel.open();

        FileChannel outChannel = FileChannel.open(Paths.get("2.jpg"),StandardOpenOption.WRITE,StandardOpenOption.CREATE);

        //绑定连接
        ssChannel.bind(new InetSocketAddress(9876));

        //获取客户端链接的通道
        SocketChannel sChannel = ssChannel.accept();

        //分配指定大小的缓冲区
        ByteBuffer buf = ByteBuffer.allocate(1024);

        //连接客户端的数据并保存到本地
        while (sChannel.read(buf)!=-1){
            buf.flip();
            outChannel.write(buf);
            buf.clear();
        }

        //发送反馈给客户端
        buf.put("服务端接受数据成功".getBytes());
        buf.flip();
        sChannel.write(buf);


        outChannel.close();
        sChannel.close();
        ssChannel.close();

    }
}




